Asquare calendar has sides that are 9 inches long what is the calendar area?

Area=l x w 
= 9 x 9 = 81 
= 81 inch squared is the answer because if  it is a  square all the sides are equal so if a square calendar's side is 9 inch squared  every side is 9 inch squared so if you have to find the area you have to multiply 9 x 9 = 81 inch squared and you will get the answer

Abit confused about what you mean, but i think you might be referring to slope intercept form: y = mx + bin that case b, or the y intercept is already given.(0,-1)find the slope by using the formulay2 - y1/x2 - x1the final slope will be 4/2, equivalent to 2.now your equation should look like thisy = 4/2x -1sorry if this didn’t you out!